ATEX REGULATION AND REQUIREMENTS

ATEX = »ATmosphere Explosive«

• Since 1 July 2003, two new standards related to safety in potentially explosive atmospheres have been in force within the European Union:
• ATEX 137 (1999/92/EC): Defines safety measures for protection of contractors working in potentially explosive atmospheres.

ATEX 95 (94/9/EC): Defines the requirements for devices operating in such potentially explosive atmospheres.

The directive (94/9/EC) also covers safety, monitoring and control devices intended for use outside the potentially explosive atmospheres but which are nevertheless required or useful for the safe operation of devices or safety systems in terms of explosion hazards.
Frequently used terms:

• Equipment is defined as machines, devices, attached or mobile units, control components with their accessories, and detection and prevention systems, the purpose of which is - separately or jointly - to create, transfer, store, measure, control and convert energy and/or process materials and may cause an explosion with their own potential ignition sources
• Safety systems are defined as complete units designed to momentarily suppress incipient explosions and/or limit the effective range of flames and explosion pressure. Safety systems may already be built into the equipment or can be sold as separate autonomous systems.
• Components are defined as individual parts necessary for the safe operation of equipment and its safety systems, but which have no autonomous function.
• Explosive atmosphere contains highly flammable substances in the form of gases, vapour, droplets or dust mixed with air in atmospheric conditions in which the flames upon ignition will spread to the rest of the flammable mixture.
• Potentially explosive atmosphere is defined as an atmosphere that may become explosive because of local or working conditions.

Equipment groups and categories:

• The group Equipment I includes equipment intended for use in underground sections of mines and in surface mining machines that are vulnerable to firedamp and/or flammable dust.
• The group Equipment II includes equipment intended for use on other sites where explosive atmosphere may pose a threat.